查找列表中所有出现的单词？

Question

I want to be able to identify all of the positions where a word appears in a sentence.

For example: Hello my name is Ben and his name is Fred.

If I input 'name' it should return: This word occurs in the places: 3 and 8

Below is my code however it will only return the first value.

text = input('Please type your sentence: ')
sentence = text.split()
word= input('Thank-you, now type your word: ')

if word in sentence:
            print ('This word occurs in the places:', sentence.index(word)+1)
elif word not in sentence:
            print ('Sorry, '+word+' does not appear in the sentence.')

Answer 1

This comprehension should do it:

[i+1 for i, w in enumerate(sentence) if w == word]

(+1 because you want first word to be 1 not 0)

Full example:

text = input('Please type your sentence: ')
sentence = text.split()
word = input('Thank-you, now type your word: ')

if word in sentence:
    print ('This word occurs in the places:')
    print([i+1 for i, w in enumerate(sentence) if w == word])
elif word not in sentence:
    print ('Sorry, ' + word + ' does not appear in the sentence.')

Answer 2

You can achieve this with simple list comprehension and enumerate function to find the index. Finally add 1 to match your expected index.

sec = 'Hello my name is Ben and his name is Fred.'
search = input('What are you looking for? ')
print ([i + 1 for i, s in enumerate(sec.split()) if s == search])

Answer 3

You cannot do it with an if. You must have one loop, like this:

occurrences = []

for word in sentence:
    if word == target_word:
        occurrences.append(sentence.index(word)+1)

You will have all the occurrences in the array 'occurrences' to print your sentence or you can change 'occurrences' for a 'print' sentence, as your preference.

Please, note that I hasn't run this code, check if it is correct spelled.

Good luck!